Philosophy Professors...

[DominionSeraph]

The worst thing is having a boring professor who says he is open to discussion, but angrily shoots down anything resembling a contrary argument, even if it's well-defended and coherent.

Things look different from above. Something that "feels" 'well-defended and coherent' to a naive undergrad looks quite different to someone with the experience and talent to see the naivete. New information can even bring up new errors that are obvious to those who already gone through it; such as how someone new to the defined pattern of logical fallacies will tend to see them in everything as they are now filtering through that lens. (Humans are pattern matchers and can be quite adept at rotating a problem and morphing it through its range of uncertainty. But the newbie will fall to a form of confirmation bias where he'll stop morphing the possibilities of the unstated premises of an opposing position when he hits upon a seemingly likely fallacy. [Just because you found a match doesn't mean you're right. The newbie often can't conceive that he might be wrong, and this causes issues.]
So the professor's viewpoint is understandable.

But a professor who angrily shoots everything down probably shouldn't be teaching. I can get away with that shit because it ain't my job to work with stupid norms and the intellectually lazy so I am under no obligation to carry y'all and do your thinking for you. But a teacher should be at ease with naivete and know how to motivate learning. A teacher certainly can't expect his students to be at the same educational level as him; them being behind is one of the defining characteristics of the student-teacher relationship. Teaching as a profession is a neverending treadmill as the new crop of students comes in just as stupid as the last class did. If you expect to "finish" and end up in peace surrounded by equals, teaching as a profession isn't for you.